Valve-gear for steam-engines.



UNITE srarns PATENT DIFIEICE.

VALVE-GEAR FOR STEAiVh-ENGJNES..

Specification of Letters Patent.

Patented Dec. 26, l1905.

Application filed May 24, 1905. Serial No. 261,992.

Beit known that I, EMILE BAUTHIERE, engineer, a subject of the King of Belgium, residing at 14 Rue du Meeridien, St. Josse-ten- N oode, near Brussels, in the Kingdom of Belgium, have invented certain new and useful Improvements in Valve-Gear for Steam-Engines, of which the following is a specification. The present invention has for its object to increase the eiciency of steam-engines in which the distribution is effected by l/Vatts simple slide-valve in its various forms, and more especially in reversing-engines the slide-valve of which is operated simultaneously by a reversing slide-block and an advance-lever. In the constructionshitherto employed this advancelever is generally operated by a connecting-rod articulated to a fixed point of the cross-head (lValscliaerts system) or by means of a lug articulated to the cross-head, in which the extremity of the long arm (Heusingers system) slides in such a manner that the movement of the slide-Valve produced by the advance-lever takes place in a manner similar to that of the pistonthat is to say, it is slow at the extremities of the stroke and accelerated at the middle. The advantages obtained with a distribution of' this kind are illusory, seeing that in the first place the anticipated discharge and the compression increase to a disastrous extent in proportion as the admission decreases, and, secondly, the apertures ofthe orifices are so small for normally reduced admissions that there follows from the throttling of the steam a considerable loss of power and of eiciency. One means of correcting these defects is to accelerate the movement of the slide-valve at the extremities of' the stroke of the piston relatively to its normal and to reduce it as much as possible at the middle of the piston-stroke. Attempts have been made to realize these desiderata; but the devices proposed for this purpose are not at all practical in their application, and they are defective for the two directions ofl running of a reversible machine.

The present invention has for its object means for effecting the improvements enumerated above in the travel of the slide-valve relatively to the travel of' the piston, but which is practical in its operation and equally applicable to engines running in one direction only or to reversible engines.

The device is represented 1n the accompanying drawings, in which- Figure l illustrates it as applied to a vertical engine. Fig. 9. is a side elevation of the lever D. Fig. 3 represents the slide-block V, and Fig. I the pivot P with its connecting-lug.

The lever A, which is connected on the one hand to the rod B of the slide-valve and to the connecting-rod C of the slide-block of the reversing-slot M, is connected onv the other hand to a lever D by the intermediary of a rod E, pivoted on `\l. ed at R on the cross-head, (or upon any other appropriate point of the motor mechanism.) This leverD forms a slot for the reception of' the slide-block V, oscillating on the pivot P, fixed to the lower cross-head guide at a point suitably determined of the perpendicular drawn at the middle, or approximately so, of the path of the cross-head pivot. It will be readily understood that at the extremities of the stroke of the piston or of the cross-head there will correspond to a given path of' this latter a relatively large travel of th'e pivot N, and consequently of' the slide-valve. At' the middle of' the stroke of the cross-head, on the contrary, for the same travel of this latter the displacement of' the pivot N will be practically mil owing to its approach to the fixed point P, and consequently the stroke of the slide-valve will be very small. When the steam is admitted at the lower edges of a circular slide-valve, the two articulations and c will be inverted.

Vhat I claim, and desire to secure by Letters Patent ofl the United States, is-

1. In a valve-gear for steam-engines, a lever pivoted on the cross-head, a slide disconnected from the cross -head and movable lengthwise of said lever and mounted to oscillate on a pivot fixed to the lower cross-head guide, an oscillating lever connected with said first-mentioned lever, the other end of' the oscillating lever being connected to the stem of the slide-valve and with the reversing-lever.

2. In a valve-gear for steam-engines, a lever pivoted on the cross-head, a slide `disconnected from the cross head and movable lengthwise of' said leverand mounted t0 oscillate on a pivot fixed to the lower cross-head guide, an oscillating` lever connected with said first-mentioned lever, the other end of the oscillating lever being connected to the stem of the slide-valve and with the reversing-lever by independent connections.

3. In a valve-gear for steam-engines, a lever pivoted on the cross-head, a slide disconnected from the cross head and movable length wise of said lever and mounted to oscillate on a pivot fixed to the lower cross-head This lever D is pivot- IOO IIO

valve-stem and at the other with the said pivotpin, and an independent Connection between the last-mentioned lever and the slide-block of the reversing-lever.

In testimony whereof I have hereunto set my hand, in presence of two subscribing' witmesses, this 12th day of May, 1905.

EMILE BAUTHIERE.

l/Vitnesses:

GUSTAVE PIERRY, EMILE N UYTs. 

